ci: Add config file for CodeRabbit with custom rules

[spetrosi]

Sourcery that we currently use cannot read documentation files and best
practices, it's rather a refactoring tool.
So I want to introduce CodeRabbit that allows creating .coderabbit.yaml with
custom rules and conventions.

Signed-off-by: Sergei Petrosian spetrosi@redhat.com

Summary by Sourcery

Add a CodeRabbit configuration file defining review behavior and project-specific conventions.

CI:

• Configure CodeRabbit code review settings, disabling nonessential features and enabling PR title/description checks with project-specific rules.

Documentation:

• Document expected conventions and requirements for tasks, handlers, tests, templates, variables, Python code, and README updates via the CodeRabbit configuration guidance.

[sourcery-ai]

Reviewer's Guide

Adds a .coderabbit.yaml configuration file to integrate CodeRabbit code review automation with repository-specific conventions, disabling non-essential features and encoding detailed, path-based review rules for Ansible roles, tests, templates, variables, Python code, and documentation.

Sequence diagram for CodeRabbit review using .coderabbit.yaml

sequenceDiagram
  actor Developer
  participant GitHub
  participant CodeRabbit
  participant Repo

  Developer->>GitHub: Open_pull_request
  GitHub-->>Repo: Store_PR_and_diff
  GitHub->>CodeRabbit: Trigger_review_webhook
  CodeRabbit-->>Repo: Read_.coderabbit_yaml
  CodeRabbit->>CodeRabbit: Apply_pre_merge_checks_title
  CodeRabbit->>CodeRabbit: Apply_custom_checks_description
  CodeRabbit->>CodeRabbit: Apply_path_instructions
  CodeRabbit-->>GitHub: Post_review_comments_and_warnings
  GitHub-->>Developer: Display_CodeRabbit_review

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File-Level Changes

Change	Details	Files
Introduce CodeRabbit review configuration and disable non-essential automated features.	Add .coderabbit.yaml with top-level chat and reviews settings Disable entertainment features like poems and fortunes Turn off auto behaviors such as auto labels, auto reviewer assignment, and automatic request-changes workflows Disable additional review extras like sequence diagrams, effort estimation, suggested labels, and high-level summaries Disable finishing-touches unit test suggestions	.coderabbit.yaml
Enforce PR metadata standards via pre-merge checks.	Configure PR title checks using Conventional Commits format with warning severity Add custom description-format check enforcing repository PR template sections (Feature/Enhancement, Reason, Result, optional Issue Tracker)	.coderabbit.yaml
Define path-specific review instructions encoding linux-system-roles conventions.	Add detailed Ansible tasks guidance for no_log usage, OSTree-compatible package installation, module usage, idempotency, check-mode support, and required tests Specify handler rules for sensitive data logging Define strict test playbook patterns using include_tasks wrapper and quality expectations Enforce template headers for Jinja2 templates Define naming/location rules for user-facing defaults and internal vars, plus documentation requirements for new variables Add Python style expectations (PEP8, Black, tox checks) Add README requirements to document new user-facing variables and usage examples	.coderabbit.yaml

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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